The twosome struck up a friendship, and possibly more, filming comedy Playing the Field in Shreveport, Louisiana in March. Biel's breakup with Justin Timberlake after four on-and-off years was still fresh, but notorious ladies' man Butler "was really flirting with her" during a cast and crew bash at a local eatery March 15, one onlooker said, and the twosome hit other hotspots together on ensuing nights.